EXCLUSIVE FEATURE... swivel clamp with swinging arm

• Permits rapid removal of vessel containing sample

Thomas MAGNETIC STIRRER In use in a closed system such as

Karl Fischer for determination of water content.

Stirrer swings aside to permit con­venient and safe removal of vessel containing sample.

A.H.T.CO.

Circle No. 94 on Readers' Service Card

9 2 A · ANALYTICAL CHEMISTRY

QUALITY AND SFRVICE

PHILA.. U.S.A. ilff:filJAM;ÎM»JJi»ÎIH

. . . the first practical Magnetic Stirrer commercially available in the U. S. — introduced by us in 1944

A compact, quiet-running apparatus which utilizes a rotating field of magnetic force to induce variable speed stirring action within either closed or open vessels. Dynamically balanced to prevent vibration and "walking."

Stirring is accomplished by means of a small magnetized bar, which is placed in the liquid to be stirred and which is rotated by magnetic force consisting of a permanent bar magnet attached to the shaft of an electric motor and mounted in an aluminum housing with flat top 4JHÎ inches diameter and 4 Ύ inches high, on cast metal base.

Can be used either on the table or on a support rod, attached by means of the clamp with swivel joint and swinging arm, an exclusive feature of the Thomas Stirrer. Center of stirrer top is adjustable between 3 and 4 λΑ inches from support rod. Stirrer can he easilv raised or lowered on the rod. and

swings in or out of position in a horizontal plane. Particularly convenient in both the mounting and use of closed system assemblies.

Suitable for any stirring operation which involves 1 ml to 1 liter of liquids with viscosities up to tha t of a 50% glycerol solution.

9235-C. Stirring Apparatus, Magnetic, Thomas, with enclosed rheostat. With graduated dial and rheostat mounted in stirrer housing. Complete with swing-out clamp, one J^-inch Kel-P coated stirring bar, one 1%-inch Pyrex coated stirring bar, 8 ft. 3-wire connecting cord with 2-prong plug, and directions for use; for 115 volts, 60 cycles, a.c 35.60 9235-G. Ditto, without stirring bars 31.85 9235-R. Stirring Apparatus, Magnetic, Thomas, with separate rheostat, for control of speed at a distance of approx. 30 inches; otherwise identical with 9235-C. For 115 volts, 60 cycles, a.c 40.30 9235-S. Ditto, without stirring bars 36.50

Copy of Bulletin 118 sent upon request.

ARTHUR H. THOMAS COMPANY More and more laboratories rely on Thomas Laboratory Apparatus and Reagents

V I N E S T . A T 3 R D · P H I L A D E L P H I A S , P A .